Visual exposure indicator in photographic apparatus

Details Visual exposure indicator in photographic apparatus Visual exposure indicator in photographic apparatus

1973-01-18

1977-07-19

Hix, L. T.

354 53, G03B 1720

Patent

active

040372324

ABSTRACT:
Three electric lamps with different voltage-illumination thresholds are connected to be successively turned on to show exposure times by an electronic switch, such as a transistor, connected to a voltage divider composed of a photoconductor, exposed to scene light, and a resistor.

REFERENCES:
patent: 3436158 (1969-04-01), Schmitt
patent: 3460450 (1969-08-01), Ogihara
patent: 3487757 (1970-01-01), Kiper
patent: 3516750 (1970-06-01), Schmitt
patent: 3532035 (1970-10-01), Fujii
patent: 3581643 (1971-06-01), Yoshimura
patent: 3603799 (1971-09-01), Nobusawa
patent: 3662659 (1972-05-01), Metzger et al.
patent: 3895876 (1975-07-01), Mori

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